It provides the "C Runtime (CRT), Standard C++, ATL, and MFC" libraries required by thousands of legacy programs.
The Microsoft Visual C++ 2008 SP1 Redistributable Package (x64) is a runtime package that provides the necessary libraries and components required to run applications developed with Visual C++ 2008 on 64-bit Windows operating systems. This package is designed to be installed on a computer to enable the execution of applications that rely on the Visual C++ 2008 runtime.
When a 64-bit application launches, Windows looks for its required DLLs in specific locations (system directories, the app’s folder, and paths defined in the registry). The msvcr90.dll file is the "C Runtime Library" version 9.0. Without it, the application’s code cannot perform basic operations like memory allocation, string manipulation, or file I/O. The system throws an error because the necessary "vocabulary" (the library) is missing.
If you see either entry, the package is installed.
C:\Windows\System32\msvcr90.dll
